I second Ang's statement; it's hard to find 'the' right insert, though it seems fairly popular to have the combo of a microfiber towel + hemp, microfiber insert like Cottonbabies (CB) or Mother of Eden (MOE) + hemp, or just either MF or hemp alone.
That being said, for us (DS) a MF insert alone only holds up to maybe 1hr, so most of the time I do MF + hemp. For night time use I can only rave about Sherri's (Leobaby04) night time inserts, super thick and super absorbant! Works 10 hrs+ for us overnight!

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~*Val*~ Veg*n SAHM to 2 kids (Feb'02 & July '05) married to my soulmate
If I don't respond, it's because we're 6 hrs ahead of EST and I might be sleeping already